I want American people to be well informed as well as Japanese. So, I have added two more comments as below to my old blog, http://keiko-amano.blogspot.com/2011/04/mark-i-reactors.html
1. An interview with Dale G. Bridenbaugh: http://www.youtube.com/watch?v=L6v2vhCmALI
I also found the following sites.
The list of 23 Mark I reactors in the U.S. I haven't researched for other countries. I hope you do and let me know.